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Theorem sltssn 28000
Description: Surreal set less-than of two singletons. (Contributed by Scott Fenton, 17-Mar-2025.)
Hypotheses
Ref Expression
sltssn.1 (𝜑𝐴 No )
sltssn.2 (𝜑𝐵 No )
sltssn.3 (𝜑𝐴 <s 𝐵)
Assertion
Ref Expression
sltssn (𝜑 → {𝐴} <<s {𝐵})

Proof of Theorem sltssn
StepHypRef Expression
1 sltssn.3 . 2 (𝜑𝐴 <s 𝐵)
2 sltssn.1 . . 3 (𝜑𝐴 No )
3 sltssn.2 . . 3 (𝜑𝐵 No )
42, 3sltssnb 27999 . 2 (𝜑 → ({𝐴} <<s {𝐵} ↔ 𝐴 <s 𝐵))
51, 4mpbird 260 1 (𝜑 → {𝐴} <<s {𝐵})
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wcel 2146  {csn 4594   class class class wbr 5114   No csur 27841   <s clts 27842   <<s cslts 27987
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-ext 2738  ax-sep 5262  ax-pr 5409
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2745  df-cleq 2758  df-clel 2841  df-ral 3083  df-rex 3093  df-rab 3420  df-v 3460  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-br 5115  df-opab 5179  df-xp 5672  df-slts 27988
This theorem is used by:  cutneg  28046  zcuts  28637  twocut  28653  nohalf  28654  pw2recs  28668  halfcut  28688  addhalfcut  28689  pw2cut2  28692  bdaypw2n0bndlem  28693  bdayfinbndlem1  28697
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